refactor: move input file for single include (#1036)

Followup to #1030

---------

Signed-off-by: Henry Schreiner <[email protected]>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: henryiii

scripts/MakeSingleHeader.py

@@ -137,7 +137,7 @@ def make_header(output, main_header, files, tag, namespace, macro=None, version=
     parser.add_argument("--output", default=None, help="Single header file output")
     parser.add_argument(
         "--main",
-        default="CLI11.hpp.in",
+        default="single-include/CLI11.hpp.in",
         help="The main include file that defines the other files",
     )
     parser.add_argument("files", nargs="+", help="The header files")

CLI11.hpp.in renamed to single-include/CLI11.hpp.in

@@ -17,9 +17,10 @@ if(CLI11_SINGLE_FILE)
     OUTPUT "${PROJECT_BINARY_DIR}/single-include/CLI11.hpp"
     COMMAND
       Python::Interpreter "${PROJECT_SOURCE_DIR}/scripts/MakeSingleHeader.py" ${CLI11_headers}
-      ${CLI11_impl_headers} --main "${PROJECT_SOURCE_DIR}/CLI11.hpp.in" --output
+      ${CLI11_impl_headers} --main "${CMAKE_CURRENT_SOURCE_DIR}/CLI11.hpp.in" --output
       "${PROJECT_BINARY_DIR}/single-include/CLI11.hpp" --version "${CLI11_VERSION}"
-    DEPENDS "${PROJECT_SOURCE_DIR}/include/CLI/CLI.hpp" ${CLI11_headers} ${CLI11_impl_headers})
+    DEPENDS "${PROJECT_SOURCE_DIR}/include/CLI/CLI.hpp" CLI11.hpp.in ${CLI11_headers}
+            ${CLI11_impl_headers})
   add_custom_target(CLI11-generate-single-file ALL
                     DEPENDS "${PROJECT_BINARY_DIR}/single-include/CLI11.hpp")
   set_property(TARGET CLI11-generate-single-file PROPERTY FOLDER "Scripts")